Control

[kon-trol’) [contra, against; rotula,z. roll]. A standard by which to check observations and insure the validity of their results. Colloquially, the term is sometimes used as a noun for control animal, or control experiment. C. Animal, one used in a control experiment. C. Experiment, an experiment carried out under normal or common circumstances or conditions, to serve as a standard whereby to test the variation or value of another experiment carried out under peculiar or abnormal circumstances. 206